Ask HN: What does your one language ecosystem look like?

As a thought experiment imagine you choose just one programming language to use throughout your entire software engineering stack. For example, OS, command line tools, editors/IDEs, libraries, frameworks, infrastructure as code, CI/CD, etc.

Practically I know this doesn't make a lot of sense but I find myself coming back to this question and I think about the tradeoffs. Questions also come up like:

- Which languages fare better than others in this context?

- If there isn't an option in the chosen language for a thing, what would be the workaround? Perhaps using a combination of other tools to achieve the capability.

- Which edge cases are the most painful?

- How long would it take to build the needed capability if it didn't already exist for the language?

I'm curious to hear what others think about this.